Once they had chosen, family disposition bound them to unremitting effort.是什么意思？

Once they had chosen, family disposition bound them to unremitting effort.

一旦选择定了,家庭教育便逼得他们孜孜不倦, 一往直前.

once

adv. 一次，一趟，一倍，曾经，一旦；conj. 一旦…就…，一经；n. 一次，一回；

例句
The Hell's Angels were once the most notorious and anarchistic of motorbike gangs.
“地狱天使”曾是飞车党中最臭名昭著和无法无天的一伙。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

chosen

adj. 挑选出来的，精选的，<宗>上帝所选的；v. 挑选( choose的过去分词 )，选择，选定，喜欢；

例句
Some of the organisations taking part protested that the delegates they had chosen were not being accredited.
一些参加的组织抗议他们所选出的代表未获委任。

family

n. 家庭，家族，孩子，祖先；adj. 家庭的，一家所有的，属于家庭的，适合全家人的；

例句
Almost like an accident of nature, this family has produced more talent than seems possible.
就像是天缘巧合，这个家族不可思议地人才辈出。

disposition

n. 性情，性格，意向，倾向，安排，配置，<军>部署，战略（战术）计划；

例句
This has given him a disposition to consider our traditions critically...
这使他倾向以批判眼光看待我们的传统。

bound

vi. 跳，弹跳，限制，接壤；vt. 给…划界，限制，使弹回，使跳跃，束缚；n. 界限，限制，跃起，（球等的）反跳；adj. 用带子绑住的，有义务的，装订的，有封面的，[化，物]结合的；

例句
The Luxembourg-based satellite service is not bound by the same strict rules as the BBC...
设在卢森堡的卫星服务公司无须像英国广播公司那样遵守严格的规定。

them

pron. 他们，她们，它们；

例句
I take care of them to the best of my abilities...
我尽我所能地照顾他们。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

unremitting

adj. 不懈的，始终不懈，坚持不懈；

例句
...his immense talent, boundless energy and unremitting application.
他横溢的才华、充沛的精力和不懈的努力

effort

n. 努力，尝试，工作，成就，杰作；

例句
...an effort to ensure that the disabled achieve real acceptance.
为确保残疾人真正得到接纳而作出的努力